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首页> 外文期刊>Journal of Infrared, Millimeter and Terahertz Waves >Temperature Dependence of Crystal Structure and THz Absorption Spectra of Organic Nonlinear Optical Stilbazolium Material for High-Output THz-Wave Generation
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Temperature Dependence of Crystal Structure and THz Absorption Spectra of Organic Nonlinear Optical Stilbazolium Material for High-Output THz-Wave Generation

机译：高输出太赫兹波产生的有机非线性光学S唑材料的晶体结构和太赫兹吸收光谱的温度依赖性

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摘要

A stilbazolium material comprising 4-dimethylamino-N'-methyl-4'-stilbazolium tosylate (DAST), which has a large nonlinear optical susceptibility, was studied for application in terahertz (THz)-wave generation. The temperature-dependent structure of the DAST crystal was measured by using powder X-ray diffraction from -100 to 200 A degrees C, indicating a volume expansion of 4.6 %. The lattice constants show anisotropic thermal expansion. Also, the temperature dependence of THz absorption spectra was measured by terahertz time-domain spectroscopy (THz-TDS) in the temperature range varying from -80 to 88.1 A degrees C. A strong absorption peak was found at around 1 THz, shifting slightly toward a lower frequency with increasing temperature. The temperature dependence of the THz spectra was compared with that of X-ray diffraction. The shifting of THz-vibrational frequencies of the DAST crystal suggests that the change in its lattice structure is temperature dependent.
机译：研究了包含4-二甲基氨基-N'-甲基-4'-甲苯磺酸噻唑鎓（DAST）的stilbazolium材料，其非线性光学敏感性大，可用于太赫兹（THz）波的产生。 DAST晶体的温度依赖性结构是通过使用从-100到200 A的粉末X射线衍射测量的，表明体积膨胀为4.6％。晶格常数显示出各向异性的热膨胀。此外，太赫兹时域光谱（THz-TDS）在-80至88.1 A摄氏度的温度范围内测量了太赫兹吸收光谱的温度依赖性。在1太赫兹附近发现了一个强吸收峰，向随着温度升高频率降低。将太赫兹光谱的温度依赖性与X射线衍射的温度依赖性进行了比较。 DAST晶体的THz振动频率的变化表明其晶格结构的变化与温度有关。

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